Swift struct with 'Any' not copied correctly into a function -


here's struct -

struct settingsitem {     var id: string!     var defaultvalue: any!      init() {     } }

then it's being used -

var item2 = settingsitem() item2.id = "abcd" item2.defaultvaule = "1234" f(item2)             // <-- breakpoint shows item

when executed, item looks @ breakpoint shown above. inside function f, item messed up.

func f(item: settingsitem) {     println(item)    // <-- bad item! }

it looks item isn't copied correctly when calling f, when tried on playground didn't reproduce.

any ideas causes this?

update

it seems working when change type of var defaultvalue: any! else, int! or string!.

also tried using default constructor (removed init()), didn't help.

why fail copy when using any?

in xcode 6.4 same behaviour in playground too.

probably best not rely on built-in string-conversion functionality that’s debugging purposes. instead, try giving type explicit printable implementation:

extension settingsitem: printable {     var description: string {         // make string whatever think appropriate         // string representation of value         return "{id: \(id), defaultvalue: \(defaultvalue)}"     } }

if add this, prints out way inside f.

p.s. i’d suggest thinking ways can remove ! , any struct, lead problems in longer-term.


Comments

Post a Comment

Popular posts from this blog

c++ - Difference between pre and post decrement in recursive function argument -

i have following sample code used pre-decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(--c); cout << c << endl; return; } } this function give output input 4 : dp3 dp2 dp1 dp0 0 1 2 3 but when use post decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(c--); cout << c << endl; return; } } output goes in infinite loop dp4 can explain me in detail why happens ? this happens because function(c--) called same value of c , when finishes c decremented. recursively called, hence called same value no chance of return , hit stack overflow error. assume this, int x = 1, y = 0; y = x++ result y == 1 , x == 2. if y = ++x , bot x , y 2.
Read more

php - Nothing but 'run(); ' when browsing to my local project, how do I fix this? -

i added new project. made mistake in projectname.conf file in sites-available apache2, led me reinstalling apache2. after reinstalling , re-enabling projects on every page of every project .. <body> run(); </body> .. i've run composer update, restarted service, restarted pc, checked config files, tried disabling new project. there nothing in error log, , access.log: 127.0.0.1 - - [15/may/2015:01:40:47 +0200] "get / http/1.1" 304 181 "-" "mozilla/5.0 (x11; ubuntu; linux x86_64; rv:38.0) gecko/20100101 firefox/38.0" maybe i'm forgetting apache2 reinstall? don't think did different last time installed it. looks haven't setup php correctly. take @ this great guide , maybe you're forgetting link php config apache2.
Read more

php - How can I echo out this array? -

i don't know how go grabbing data in variable , put foreach loop. class tree{ private $info = array( array('name'=>'jim','state'=>'nu','company'=>'nu','phone'=>array('cell'=>'5615111111','office'=>'5611111111'),'email'=>array('primary'=>'exs@example.com','ex@there.com')), array('name'=>'joe smith','city'=>'phoenix','phone'=>'4805551111','email'=>'jsmith@some_email.com'), array('name'=>'john doe','city'=>'chandler','company'=>'doe co.','email'=>array('jdoe@gmail.com','personal'=>'email@email.com'),'phone'=>'6025550002') ); } if you're inside of class, can access private variable using $this->variablename . example, i
Read more